Dry spinning process with a gas flow amplifier

Plastic and nonmetallic article shaping or treating: processes – Forming continuous or indefinite length work – Shaping by extrusion

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264204, 425 72S, D01F 700

Patent

active

044029004

ABSTRACT:
In conventional dry-spinning processes forming a hollow bundle of filaments, a heated inert gas is introduced to evaporate spinning solvent from the filaments, and a vacuum may be applied in the center of the bundle near the face of the spinneret to assist in drawing the heated inert gas through the filament bundle. A Coanda-flow entrainment device in the center of the bundle adjacent the spinneret face uses a small inlet gas flow directed along a Coanda surface. The device entrains gas, pulling it through the filament bundle and then directing it downward. This entrained flow can supplement or supplant the vacuum-induced flow through the filaments.

REFERENCES:
patent: 1933587 (1933-11-01), Dreyfus et al.
patent: 1942540 (1934-01-01), Dreyfus et al.
patent: 2131810 (1938-10-01), Kinsella et al.
patent: 3521325 (1970-07-01), Schippers
patent: 3737508 (1973-06-01), Weir
patent: 4123208 (1978-10-01), Klaver et al.

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